Pressure-reducing valve.



J. GRAHAM.

PRESSURE REDUCING VALVE.

APPLICATION FILED MAR. 21. 1914.

1,166,357. Iatented Dec. 28, 1915.

3 SHEETS-SHEET l- JbWv arm/W1; %M W w 711/ W J. GRAHAM.

PRESSURE REDUCING VALVE.

APPLICATION nuzu MAR. 21. 1914.

Llfifififi'ym Patented Dec. 28, 1915-.

3 SHEETS-SHEET 2.

COLUMBIA PLANOGRAPH CO..WASHINOTON. D c,

I. GRAHAM.

PRESSURE REDUCING VALVE.

APPLICATION FILED MAR. 21. 19:4.

w 5a Patented Dec. 28, 19151.

. 3 SHEETS SHEET 3- COLUMBIA PLANOIJRAPH C0,, WASHINGTON, D. c.

JOHN GRAHAM, OF GLASGOW, SCOTLAND.

PRESSURE-REDUCING VALVE.

Specification of Letters Eatent.

Patented Dec. 28,1915,

Application filed March 21, 1914. Serial No. 826,297.

To all whom it may concern: Be it known that 1, JOHN GRAHAM, engineer, a subject of the King of Great Brltaln and Ireland, and a resident of Glasgow,

Scotland, have invented certain new and useful Improvements in Pressure Reducing Valves, of which the following is a specification.

This invention relates to improvements in pressure reducing valves and consists in the construction and arrangement of a valve which may be employed as a reducing valve to maintain a constant pressure on the low pressure side, or as a surplus valve to pass away from the high pressure side any pressure accumulating there, above that desired, to any suitable vessel or reservoir where that surplus pressure can be advantageously used, either effect being produced by fitting to the main valve a suitably constructed regulating valve. V

In order that others skilled in the art to which my invention relates may properly understand same, I have hereunto appended three sheets of illustrative drawings in which- Figure 1 is a sectional view of the main Valve and Fig. 2 a sectional view of the lower part of the valve illustrating .its adaptation to hydraulic work. Fig. 3 is .an elevation of the main valve as used as a pressure reducing valve with regulating valve attached and shown in section. Fig.4 is an elevation of the main valve as used as a surplus valve, for reducingover pressure on the high pressure side, with suitable regulating valve attached and shown in section, and Figs. 5 and 6 are fragmentary side elevations, partly in section, of Figs. 3 and 4|: respectively.

The main valve, as illustrated by Fig. 1, consists of the valve 1 resting normally on its seat 2 fitted in an opening in the partition of the valve casing 3, and fittcdwith a piston 4E secured on the lower end of the valve spindle 5, the upper end of which works in the guide 12. The piston 1 works within the cylinder 6, and supports the flexible diaphragm I which rests also on the edge of the cylinder 6 to make a pressure fluid tight joint when the valve is shut and the piston is at its lowest position to prevent fluid under pressure passing the piston 4:.

A cover consisting of the flanged disk $4; is secured on the valve spindle 5 to divert any dirt entering along with the pressure fluid and deposit same in the space between the cylinder 6 and the valve casing 3. A port 45 is formed through the casing so that a blow oficock may be connected thereto 'by which the dirt deposited may be periodically blown off. When used for hy draulic work, the piston 4, in this case formed in two parts, is fitted with cup leather or flexible packing 46, as shown by Fig. 2, to make a tight joint under pressure and the diaphragm 7 is dispensed with. A spring 8 is fitted around the valve spindle 5 between the valve 1 and the cover 9 of the valve casing, which spring tends normally to keep the valve 1 closed. The casing 8 is formed with the usual inlet branch 10 and outlet 11. A duct 30 is formed connecting the space below the piston 4 to the outlet side of valve to allow any high pressure fluid passing the piston 4, when the valve is open and the diaphragm is raised, to flow away to the low pressure side of the valve.

When the main valve is used as a pressure reducing valve, as illustrated by Fig. 3, the regulating valve is constructed as follows: A valve 12 resting normally on its seat 13 in the casing 1st is formed with a hollow balancing piston 15 working within a cylinder 16 formed in the cap 17 and with a balancing piston 18 below working within a sleeve 19 formed in valve casing 14:. A

spring 20 is fitted between the bottom of the hollow piston 15 and the cap 17 to keep the valve 12 normally pressed on to itsseat. The upper end of valve rod 21 abuts against the piston 18 and is fitted at its lower end with a ferrule 22, a washer 23, a flexible diaphragm 2i and a piston 25. The piston 25 is held up against the diaphragm 24 by the nut 26 which is screwed on to the valve rod 21. The lower end of the valve rod 21 is pressed upon by the lever 27 fulcrumed on the casing and acted on by the spring 28, the movement being regulated by the screwed pin 29.

The action is as follows: High pressure fluid enters by the inlet branch 10, flows through the port 31-making connection between the inlet side of main valve and the regulating valve, and fills the space around the valve 12. The valve 12 is opened by the tension of the spring 28 acting on the valve rod 21 by means of the lever 27 when the device is first installed or upon a reduction of the pressure in the outlet conduit 11. The valve 12 being opened, the high pressure fluid passes into the chamber 32 below the valve, whence it passes by the port 33, duct 34 and port to the chamber beneath the piston 4 of the main valve, and the diaphragm 7. This action gives high pressure fluid on both sides of piston 4c and diaphragm 7 and allows the'valve 1 tb open and admit pressure fluid to the outlet side of the main valve.

The space above the diaphragm 24 of regulating valve is connected to the outlet side of main valve by the port 36, situated in front of the regulating valve, duct 3? and port 38. When pressure in the outlet branch 11 rises to therequired extent, it acts on the area of diaphragm 24 to close the valve 12, the high pressure fluid'then ceases to pass to the chamber below the piston 4 of main valve and the diaphragm 7 being of greater area than the main valve 1, the pressure acting on the diaphragm closes the main valve 1 and stops the passage of pressure from the inlet to the outlet side of main valve. Any

pressure fluid passing the piston 15 passes by way of the port 39, 'duct or pipe 40 and port 38 to the'outlet side of main valve. When main valve 1 is closed by reason of there being sufficient pressure on the outlet side or when the spring 28 is not in tension, the high pressure entering from inlet acts on top side of diaphragm 7, this having less pressure on the underside is held firmly against the face of cylinder 6 and makes a pressure tight joint, thus allowing no leakage to the reduced pressure side of the valve through duct 30.

lVhen the main valve is used as a surplus valve, to reduce the pressure on the inlet side, as illustrated by Fig. 4, the regulating valve is constructed as follows: The valve 12 is held against its seat 13 in the casing 14. by the spring 28 acting on the valve rod 21 by means of the lever 27. A port 31 connects the high pressure side of the main valve to the space above the valve 12 and a. port 33 connects the space below the valve to the space below the piston 4: of the main valve by the duct 34 and port 35. The valve rod 21 passes at its upper end through the guide 41 which has holes drilled through it. The lower end of valve rod is fitted with the ferrule 22, washer 23, diaphragm 24:, piston 25 and nut 26 as in regulating valve before described.

The action is as follows: High pressure fluid enters main valve by inlet 10 and passes into chamber on top side of valve 12 by the port 31. If this pressure is sufiicient to overcome the tension of spring 28, the valve 12 opens and allows the high pressure fluid to pass through port 33, duct 34; and port 35 into chamber under piston 1 in main valve cylinder 6 causing main valve 1 to open and allow pressure to flow into low pressure side of main valve. Vhen the high pressure falls again and the spring 28 closes valve 12, the high pressure is stopped from passing into cylinder under piston -1- and main valve 1 then comes to its seat again by reason of the high pressure acting on the top side of diaphragm 7 which only has reduced pressure on its underside. tions are repeated according sures vary.

\Vhat I claim and desire to secure by Letters Patent is 1. The combination in a pressure reducing valve of a casing having a valve seat; a valve for said seat; a spindle on said valve; a spring on the spindle between the valve and the casing; a cylinder in said casing: a piston on the spindle operative in said cvlinder, a diaphragm supported by the spindle in position to engage the edge of the cylinder; and a second valve for governing the operation of the first valve.

2. The combination in a pressure reducing valve of a valve casing having a valve seat; a valve for said seat; a spindle on said valve; a spring on the spindle between the valve and the casing; a cvlinder in said casing: a piston on the spindle and operative in said cylinder; a diaphragm for forming a fluid tight joint between the piston and the cylinder; a flanged plate for the cylinder and piston; and a valve for governing the operation of said first valve.

3. The combination in a pressure reducing valve of a casing having a valve seat; a valve for said seat; a spindle on said valve; a spring on the spindle between the valve and the casing; a cylinder in said casing; a piston on the spindle and operative in said cylinder; means for forming a fluid tight joint between the piston and the cvlinder operative only when the valve occupies its closed position; a flanged plate forming a cover for the cylinder and piston, and a regulating valve for governing the operation of said first valve.

4:. The combination in a pressure reducing valve of a casing; a valve therein; a spindle The acas the pres on said valve; a cylinder; a piston on said spindle operative in the cylinder; means for forming a fluid tight joint between the piston and cylinder mounted to be operative only when the valve is closed; with a disk covering said means and the top of said cylinder, and having a flange inclosing the outer end of the cylinder.

5. The combination in a pressure reducing valve of a casing; a valve therein; a spindle on said valve; a cylinder; a piston on the spindle operative in the cylinder; and a diaphragm supported by the piston and resting on the edge of the cylinder to form a fluid tight joint between the latter and said 1 JOHN GRAHAM.

Witnesses:

R. C. THOMSON, M. MACKENZIE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

